21280525143 has 8 divisors (see below), whose sum is σ = 29289325056. Its totient is φ = 13729371000.

The previous prime is 21280525051. The next prime is 21280525163. The reversal of 21280525143 is 34152508212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21280525143 - 2⁹ = 21280524631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21280525163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114411333 + ... + 114411518.

It is an arithmetic number, because the mean of its divisors is an integer number (3661165632).

Almost surely, 2^21280525143 is an apocalyptic number.

21280525143 is a deficient number, since it is larger than the sum of its proper divisors (8008799913).

21280525143 is a wasteful number, since it uses less digits than its factorization.

21280525143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228822885.

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 21280525143 in words is "twenty-one billion, two hundred eighty million, five hundred twenty-five thousand, one hundred forty-three".